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Thirring model

thirring model
The Thirring model is an exactly solvable quantum field theory which describes the self-interactions of a Dirac field in 1+1 dimensions


  • 1 Definition
  • 2 Massless case
    • 21 Exact solution
  • 3 Massive Thirring model, or MTM
    • 31 Exact solution
  • 4 Bosonization
  • 5 See also
  • 6 References
  • 7 External links


The Thirring model is given by the Lagrangian density

L = ψ ¯ i ∂ / − m ψ − g 2 ψ ¯ γ μ ψ ψ ¯ γ μ ψ   }=}i\partial \!\!\!/-m\psi -}\left}\gamma ^\psi \right\left}\gamma _\psi \right\ }

where ψ = ψ + , ψ − ,\psi _} is the field, g is the coupling constant, m is the mass, and γ μ } , for μ = 0 , 1 , are the two-dimensional gamma matrices

This is the unique model of 1+1-dimensional, Dirac fermions with a local self-interaction Indeed, since there are only 4 independent fields, because of the Pauli principle, all the quartic, local interactions are equivalent; and all higher power, local interactions vanish Interactions containing derivatives, such as ψ ¯ ∂ / ψ 2 }\partial \!\!\!/\psi ^} , are not considered because they are non-renormalizable

The correlation functions of the Thirring model massive or massless verify the Osterwalder-Schrader axioms, and hence the theory makes sense as a quantum field theory

Massless case

The massless Thirring model is exactly solvable in the sense that a formula for the n -points field correlation is known

Exact solution

After it was introduced by Walter Thirring, many authors tried to solve the massless case, with confusing outcomes The correct formula for the two and four point correlation was finally found by K Johnson; then C R Hagen and B Klaiber extended the explicit solution to any multipoint correlation function of the fields

Massive Thirring model, or MTM

The mass spectrum of the model and the scattering matrix was explicitly evaluated by Bethe Ansatz An explicit formula for the correlations is not known J I Cirac, P Maraner and J K Pachos applied the massive Thirring model to the description of optical lattices

Exact solution

In one space dimension and one time dimension the model can be solved by the Bethe Ansatz This helps one calculate exactly the mass spectrum and scattering matrix Calculation of the scattering matrix reproduces the results published earlier by Alexander Zamolodchikov The paper with the exact solution of Massive Thirring model by Bethe Ansatz was first published in Russian Ultraviolet renormalization was done in the frame of the Bethe Ansatz The fractional charge appears in the model during renormalization as a repulsion beyond the cutoff

Multi-particle production cancels on mass shell

The exact solution shows once again the equivalence of the Thirring model and the quantum sine-Gordon model The Thirring model is S-dual to the sine-Gordon model The fundamental fermions of the Thirring model correspond to the solitons of the sine-Gordon model


S Coleman discovered an equivalence between the Thirring and the sine-Gordon models Despite the fact that the latter is a pure boson model, massless Thirring fermions are equivalent to free bosons; besides massive fermions are equivalent to the sine-Gordon bosons This phenomenon is more general in two dimensions and is called bosonization

See also

  • Dirac equation
  • Gross-Neveu model
  • Nonlinear Dirac equation
  • Soler model


  1. ^ Thirring, W 1958 "A Soluble Relativistic Field Theory" Annals of Physics 3: 91–112 Bibcode:1958AnPhy391T doi:101016/0003-49165890015-0 
  2. ^ Johnson, K 1961 "Solution of the Equations for the Green's Functions of a two Dimensional Relativistic Field Theory" Il Nuovo Cimento 20 4: 773 Bibcode:1961NCim20773J doi:101007/BF02731566 
  3. ^ Hagen, C R 1967 "New Solutions of the Thirring Model" Il Nuovo Cimento B 51: 169 Bibcode:1967NCimB51169H doi:101007/BF02712329 
  4. ^ Klaiber, B 1968 "The Thirring Model" Lect Theor Phys 10A: 141–176 OSTI 4825853 
  5. ^ Cirac, J I; Maraner, P; Pachos, J K 2010 "Cold atom simulation of interacting relativistic quantum field theories" Physical Review Letters 105 2: 190403 arXiv:10062975  Bibcode:2010PhRvL105b0403B doi:101103/PhysRevLett105190403 PMID 21231152 
  6. ^ Korepin, V E 1979 "Непосредственное вычисление S-матрицы в массивной модели Тирринга" Theoretical and Mathematical Physics 41: 169  Translated in Korepin, V E 1979 "Direct calculation of the S matrix in the massive Thirring model" Theoretical and Mathematical Physics 41 2: 953 Bibcode:1979TMP41953K doi:101007/BF01028501 
  7. ^ Coleman, S 1975 "Quantum sine-Gordon equation as the massive Thirring model" Physical Review D 11 8: 2088 Bibcode:1975PhRvD112088C doi:101103/PhysRevD112088 

External links

  • On the equivalence between sine-Gordon Model and Thirring Model in the chirally broken phase

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    Thirring model beatiful post thanks!


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